Chesias isabella
In 3 days ~30% in a week ~50%
Chesias isabella is a moth of the family Geometridae. It was described by Schawerda in 1915. It is found in France, Spain and Portugal. The wingspan is 36–39 millimetres (1.4–1.5 in). There is one generation per year with adults on wing from May to July. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Sierra de Guadarrama National Park | 🇪🇸 Spain |
More parks will be added in future updates.
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Porto | 🇵🇹 Portugal |
With luck
About 10% of wildlife watchers report a Chesias isabella sighting in Porto on a given day, based on 67 verified sightings from GBIF citizen-science data. It is the 88th most-seen of the 498 insects we can rate there. Over three days the chance rises to about 30%, and over a week to about 50%, if each day is a fresh chance.
January to April
In those months about 20% of wildlife watchers report a Chesias isabella in Porto on a given day, against under 5% in July to October, the lowest months.
Between midnight and 3 am
Across all the parks we cover, that three-hour window holds the most Chesias isabella sightings with a recorded time, and about 8 in 10 of them come between 6 pm and 6 am: it is mostly seen at night.
Only Porto, in our data
Porto is the only city on Wallace's Line with enough records to rate Chesias isabella sightings: about 10% of wildlife watchers there report one on a given day.
Same family: Geometridae
The closest relatives of the Chesias isabella that you can see in Porto (family Geometridae, Geometer Moths) are Double-Striped Pug (about 20%), Vestal (about 20%) and Pale Oak Beauty (about 20%), with each one's daily chance of a sighting.
GBIF citizen-science records
It is estimated from how often the Chesias isabella is recorded against all the insects logged in Porto (67 verified sightings), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
